CN110138014A - The integrated solar power generation subsystem of grid-connected off-network and system - Google Patents
The integrated solar power generation subsystem of grid-connected off-network and system Download PDFInfo
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- CN110138014A CN110138014A CN201910529434.3A CN201910529434A CN110138014A CN 110138014 A CN110138014 A CN 110138014A CN 201910529434 A CN201910529434 A CN 201910529434A CN 110138014 A CN110138014 A CN 110138014A
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- 238000010248 power generation Methods 0.000 title claims abstract description 31
- 238000004146 energy storage Methods 0.000 claims abstract description 106
- 230000005611 electricity Effects 0.000 claims abstract description 64
- 238000006243 chemical reaction Methods 0.000 claims abstract description 58
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 33
- 230000002159 abnormal effect Effects 0.000 claims description 6
- 238000013481 data capture Methods 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 3
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- 238000010586 diagram Methods 0.000 description 7
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- 238000007599 discharging Methods 0.000 description 6
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- 239000013078 crystal Substances 0.000 description 2
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- 230000002441 reversible effect Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- MARUHZGHZWCEQU-UHFFFAOYSA-N 5-phenyl-2h-tetrazole Chemical compound C1=CC=CC=C1C1=NNN=N1 MARUHZGHZWCEQU-UHFFFAOYSA-N 0.000 description 1
- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
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- 230000000295 complement effect Effects 0.000 description 1
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- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H02J3/385—
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
A kind of integrated solar power generation subsystem of grid-connected off-network and system, the voltage and current information of module, energy-storage module and civil power module including main control module acquisition solar energy, it is powered state switching according to the voltage and current information of acquisition, exports corresponding control instruction；Maximal power tracing module boosts the direct current that the solar energy module exports, and obtains the voltage boosting dc electricity for load supplying；Bidirectional, dc conversion module carries out energy-storage module charging according to corresponding control instruction or energy-storage module is powered；Energy-storage module charging is that the voltage boosting dc electricity that will be received is depressured and is stored in the energy-storage module；Energy-storage module power supply is that the voltage of the energy-storage module boosts, voltage boosting dc electricity of the output for load supplying；Inverter module receives the voltage boosting dc electricity by bus, and the voltage boosting dc electricity is carried out exchange conversion according to corresponding control instruction, and output is supplied to the alternating current of load.Energy conversion is reduced, it is easy to use.
Description
Technical field
The present invention relates to field of power electronics, and in particular to the integrated solar power generation subsystem of grid-connected off-network and is
System.
Background technique
Off-network type solar power system refers to that the electricity storage that photovoltaic generating system issues passes through inversion to battery
Device becomes alternating current electricity supply and use equipment and directly uses, or without inversion directly for direct-flow electricity utilization apparatus electricity consumption, not with electricity
Net is connected.It is widely used in the application places such as remote mountainous area, non-Electric region, island, communication base station.System is generally by sun electricity
Pond component composition photovoltaic array, solar charging discharging controller, battery group, off-network type inverter, DC load with exchange
Load etc. is constituted.Photovoltaic array converts the solar into electric energy in the case where there is illumination, passes through solar charging discharging controller
Powering load, while giving battery charging；In cloudy gas or no light, by solar charging discharging controller by storing
Battery pack is powered to DC load, while battery will also power directly to separate inverter unit, be reverse by separate inverter unit
Alternating current is powered to AC load.
Referring to Fig. 1, traditional off-network solar power system is not depend on power grid and independently operated system, is mainly had too
The components compositions such as positive energy solar panel, energy storage battery, charging-discharging controller, inverter.The electricity that solar panel issues, via
MPPT circuit directly with battery and connect, flow directly into battery and store, convert solar energy into battery electric energy,
When alternating current lacks, when needing to electric power supply, DC current in battery is through inverter and is converted into the alternating current of 220V, warp
It is powered to the load by two-way DC/DC circuit and inverter circuit, this is the charge and discharge process of a repetitive cycling.When there is alternating current,
The then off-network solar power system then not powering load carries out bypass band by alternating current and carries, charges to battery, solar energy group
Part charges to battery via MPPT module, and the electric energy that sun component generates first is stored in battery by the decompression of buck circuit
Group powers to the load in the insufficient situation of alternating current power supply, then by battery group with solar components simultaneously.Inventor exists
It is when implementing the integrated solar power generation subsystem of the grid-connected off-network of the present invention, discovery which has following defect: supplying in electric power
More stable area is answered, is typically all to be powered by alternating current, then the energy that solar components generate will be converted to battery
Voltage carries out energy storage, is supplied to inverter circuit by the boosted link of battery again until alternating current missing.When power supply abundance
The solar energy of progress is converted into battery electric energy, and multilevel energy conversion leads to decrease in efficiency, electric quantity loss.Due to battery
Voltage is lower, and the input voltage of solar components array is restricted, this cause in the construction process solar components need compared with
More parallel connections, constructional difficulties.Off-network type solar power system is not suitable for the convenient place use of electricity consumption thus, hardly results in big
The popularization and use of range.
A kind of off-network type solar power system that the convenient place of suitable electricity consumption uses is needed thus.
Summary of the invention
The invention mainly solves the technical problem of providing a kind of solar power generations that the suitable convenient place of electricity consumption uses
System reduces energy conversion, to reduce the electric quantity loss of energy conversion tape.
According in a first aspect, provide a kind of integrated solar power generation subsystem of grid-connected off-network in a kind of embodiment, wrap
It includes:
Main control module, for obtaining the voltage and current of solar energy module, the voltage and current and alternating current mould of energy-storage module
The voltage and current information of block is powered state switching according to the voltage and current information of acquisition, exports corresponding control
System instruction；
Maximal power tracing module, the direct current for exporting the solar energy module boost, obtain for bearing
Carry the voltage boosting dc electricity of power supply；
Bidirectional, dc conversion module, for carrying out energy-storage module charging or energy-storage module confession according to corresponding control instruction
Electricity；Wherein, the energy-storage module charging is that the voltage boosting dc electricity that will be received is depressured and is stored in the energy-storage module；Its
In, the energy-storage module power supply is that the voltage of the energy-storage module boosts, and output is used for the voltage boosting dc of load supplying
Electricity；
Inverter module, for receiving voltage boosting dc electricity by bus, and according to corresponding control instruction by the liter
Straightening galvanic electricity carries out exchange conversion, and output is for supplying the alternating current of load.
In another embodiment, the maximal power tracing module includes boost booster circuit.
In another embodiment, the inverter module is also used to the civil power module according to corresponding control instruction
Alternating current carries out DC converting, obtains the direct current to charge for energy-storage module；
The bidirectional, dc conversion module is also used to that the direct current for being used for energy-storage module charging is depressured and is deposited
It is stored in the energy-storage module.
In another embodiment, the main control module includes:
Data capture unit is used for, and obtains the voltage and current of solar energy module, the voltage and current of energy-storage module and city
The voltage and current information of electric module；
Status toggle unit is used for, and when energy-storage module is abnormal, civil power module is normal and solar energy module is normal, will be powered
State is switched to civil power module and combines power supply state with solar energy module, in energy-storage module exception, civil power module exception and the sun
Can module it is normal when, power supply state is switched to solar energy module power supply state, energy-storage module is normal, civil power module is normal and
When solar energy module is normal, power supply state is switched to the state of power supply-charging, energy-storage module is normal, civil power module is abnormal and
When solar energy module is normal, power supply state is switched to energy-storage module and combines power supply state with solar energy module；
Instruction output unit is used for, and is switched to civil power module in the power supply state and is combined power supply state with solar energy module
When, output control solar energy module combines power supply instruction with civil power module, is switched to solar energy module in the power supply state and supplies
Electricity condition, output control solar energy module power supply instruction are switched to power supply-charging state, output control city in the power supply state
Electric module combines power supply with solar energy module, and controls the instruction that solar energy module charges to the energy-storage module, in the confession
Electricity condition is switched to energy-storage module and combines power supply state with solar energy module, and output control energy-storage module is combined with solar energy module
The instruction of power supply.
In another embodiment, the main control module further include:
Power obtaining unit is used for, and obtains the output power inverter and bearing power of inverter module；
Isolated island control unit is used for, and it is defeated to be less than present load power, the inverter module according to current output power inverter
Power and the bearing power out, the period reduces current output power inverter one by one, with when isolated island occurs load terminal voltage with
The output power inverter reduce and reduce；
It cuts off unit to be used for, when detecting that load terminal voltage is decreased to preset value, the relay of civil power module is disconnected,
Realization civil power module is cut off with the grid-connected integrated solar power generation subsystem of off-network.
According to second aspect, a kind of integrated solar power system of grid-connected off-network is provided in a kind of embodiment, it is special
Sign is, including the integrated solar power generation subsystem of the upper grid-connected off-network, solar energy module, energy-storage module and alternating current
Module；
The solar energy module, for converting the solar into electric energy；
The energy-storage module, for storing electric energy；
The civil power module, for by the power output of public electric wire net.
The application's the utility model has the advantages that
A kind of grid-connected integrated solar power generation subsystem of off-network provided by the present application, comprising: main control module, for obtaining
The energy information for taking solar energy module, energy-storage module and civil power module, according to the energy information, that is, voltage and current of acquisition
Information is powered state switching, exports corresponding control instruction；Maximal power tracing module is used for the solar energy module
The direct current of output boosts, and obtains the voltage boosting dc electricity for load supplying；Bidirectional, dc conversion module, for according to right
The control instruction answered carries out energy-storage module charging or energy-storage module power supply；Wherein, the energy-storage module charging will receive
Voltage boosting dc electricity is depressured and is stored in the energy-storage module；Wherein, the energy-storage module power supply is by the energy-storage module
Voltage boost, output for load supplying voltage boosting dc electricity；Inverter module, for receiving the boosting by bus
Direct current, and the voltage boosting dc electricity is carried out by exchange conversion according to corresponding control instruction, it exports for being supplied to load
Alternating current.It is boosted by the direct current that the maximal power tracing module exports solar energy module, obtains to be supplied to
Load the direct current that is powered, then after the direct current of solar energy module output is stored without energy-storage module again into
Row load supplying, reduces the conversion of energy, and reduces the loss of energy, avoids and is transmitting energy by solar energy module
The multistage conversion passed through when measuring to load, improves energy conversion efficiency.Bidirectional, dc conversion module can be to DC voltage liter
Pressure can also be depressured, then the charge and discharge of the energy-storage module may be implemented.
A kind of grid-connected integrated solar power system of off-network provided by the present application, comprising: grid-connected off-network is integrated
Solar power generation subsystem, solar energy module, energy-storage module and civil power module；The solar energy module, for turning solar energy
It is changed to electric energy；The energy-storage module, for storing electric energy；The civil power module, for by the power output of public electric wire net.Pass through
The integrated solar power generation subsystem of grid-connected off-network, reduces the conversion of energy, and reduce the loss of energy, keeps away
Exempt from the multistage conversion passed through when transmitting power to load by solar energy module, improves energy conversion efficiency.
Detailed description of the invention
Fig. 1 is traditional off-network solar power system figure；
Fig. 2 is the grid-connected integrated solar power generation subsystem schematic diagram of off-network provided in this embodiment；
Fig. 3 is maximal power tracing module diagram provided in this embodiment；
Fig. 4 is another grid-connected integrated solar power generation subsystem schematic diagram of off-network provided in this embodiment；
Fig. 5 is inverter module schematic diagram provided in this embodiment；
Fig. 6 is bidirectional, dc conversion module schematic diagram provided in this embodiment；
Fig. 7 is the grid-connected integrated solar power system schematic diagram of off-network provided in this embodiment.
Specific embodiment
Below by specific embodiment combination attached drawing, invention is further described in detail.Wherein different embodiments
Middle similar component uses associated similar element numbers.In the following embodiments, many datail descriptions be in order to
The application is better understood.However, those skilled in the art can recognize without lifting an eyebrow, part of feature
It is dispensed, or can be substituted by other elements, material, method in varied situations.In some cases, this Shen
Please it is relevant it is some operation there is no in the description show or describe, this is the core in order to avoid the application by mistake
More descriptions are flooded, and to those skilled in the art, these relevant operations, which are described in detail, not to be necessary, they
Relevant operation can be completely understood according to the general technology knowledge of description and this field in specification.
It is formed respectively in addition, feature described in this description, operation or feature can combine in any suitable way
Kind embodiment.Meanwhile each step in method description or movement can also can be aobvious and easy according to those skilled in the art institute
The mode carry out sequence exchange or adjustment seen.Therefore, the various sequences in the description and the appended drawings are intended merely to clearly describe a certain
A embodiment is not meant to be necessary sequence, and wherein some sequentially must comply with unless otherwise indicated.
It is herein component institute serialization number itself, such as " first ", " second " etc., is only used for distinguishing described object,
Without any sequence or art-recognized meanings.And " connection ", " connection " described in the application, unless otherwise instructed, include directly and
It is indirectly connected with (connection).
It should be noted that off-network type solar power system is specific to no power grid area or often has a power failure ground at present
The electricity storage that issues of photovoltaic generating system to battery used in area, by inverter become alternating current for
Electric equipment directly uses, or without inversion directly for direct-flow electricity utilization apparatus electricity consumption, is not connected with power grid or power grid is used to
Charging, bypass band carry.The power generation of parallel networking type solar electricity generation system is stored without storage device, directly by being reverse into state's household electrical appliances
Net needs and electricity requires voltage, and preferential for household use.It is grid-connected, it is exactly necessarily connected to public electric wire net, is exactly solar energy
Power generation, domestic electric network, public electric wire net link together, this is the electricity generation system that must be relied on existing power grid and could run.It is main
To be made of solar panel and inverter, solar panel issue directly through inverter be converted into 220V alternating current and to
Household electrical appliance power supply, when the generated energy of solar energy is more than the electricity that household electrical appliance use, extra electricity has just been transported to public
Power grid；And when solar energy generated energy not be able to satisfy household electrical appliance in use, supplemented from power grid automatically.Existing grid type
When public electric wire net powers off, solar energy power generating can not be run solar power system.And the application generates electricity in off-network type
It is improved on the basis of system, the transmission for the amount of enabling it to is more convenient, provides a kind of convenient place use of suitable electricity consumption
Off-network type solar power system, be exactly the integrated solar power generation subsystem of grid-connected off-network of the application.
Once each module in Fig. 1, MPPT module mainly carry out maximal power tracing to solar components to brief description.
Two-way DC/DC circuit realizes battery voltage and the conversion of BUS voltage, and DC voltage is converted to alternating voltage by inverter module 04,
It powers to the load.Main control unit carries out data sampling and control.Its course of work is as follows: in the case of alternating current, solar energy is sufficient
Under, it charges to battery, while powering to the load via two-way DC/DC and inverter module 04；In the insufficient situation of solar energy,
Battery and solar association are powered to the load by two-way DC/DC and inverter module 04.In the case of having alternating current, solar energy is sufficient
Under, it is charged from solar energy to battery, alternating current powers to the load；In the insufficient situation of solar energy, solar energy is filled to battery
Electricity, alternating current power to the load while charging to battery.
Embodiment one
Referring to fig. 2, Fig. 2 is the grid-connected integrated solar power generation subsystem schematic diagram of off-network provided in this embodiment.One
A kind of integrated solar power generation subsystem of grid-connected off-network is provided in kind of embodiment, including main control module 01, maximum power with
Track module 02, bidirectional, dc conversion module 03 and inverter module 04, are specifically described below.
Main control module 01 is for obtaining the voltage and current of solar energy module, the voltage and current of energy-storage module and alternating current mould
The voltage and current information of block is powered state switching according to the voltage and current information of acquisition, exports corresponding
Control instruction carries out state switching according to the energy of the energy of solar energy module, the energy of energy-storage module and civil power module,
In, energy includes electric current and voltage.Maximal power tracing module 02 be used for the direct current that exports the solar energy module into
Row boosting obtains the voltage boosting dc electricity for load supplying.Bidirectional, dc conversion module 03 is used for according to corresponding control instruction
Carry out energy-storage module charging or energy-storage module power supply；Wherein, energy-storage module charging be the voltage boosting dc electricity that will receive into
Row is depressured and is stored in the energy-storage module；Wherein, the energy-storage module power supply is to rise the voltage of the energy-storage module
Pressure, voltage boosting dc electricity of the output for inverter module power supply.Inverter module 04, for receiving the voltage boosting dc by bus
Electricity, and the voltage boosting dc electricity is carried out by exchange conversion according to corresponding control instruction, export the exchange for being supplied to load
Electricity.
In embodiments of the present invention, on the basis of traditional off-network inverter, by solar maximum power tracking module 02
BOOST circuit is replaced with by BUCK circuit, the energy that solar components generate directly is connected to BUS bus.In the feelings for having alternating current
The energy that solar components generate under condition directly and connects and alternating current via MPPT (maximum power tracing) circuit and inverter module 04,
Carry out it is grid-connected combine power to the load, improve solar energy conversion efficiency, meanwhile, extra solar energy is converted via bidirectional, dc
Module 03 charges to energy-storage module battery；In the case where alternating current missing, the energy that solar components generate is via inversion mould
Block 04 generates alternating voltage and powers to the load, while carrying out energy using bidirectional, dc conversion module 03 and energy-storage module battery
Interaction ----charge to battery or insufficient energy is supplemented by battery.02 main function of maximal power tracing module is to realize
Using boost circuit, track the ceiling capacity that solar components array generates, the energy power to the load via inverter circuit or
It charges via bidirectional, dc conversion module 03 to battery.Direct current can be converted to alternating current supply load by inverter module 04,
The alternating current of alternating current can also be converted to direct current and charged via bidirectional, dc conversion module 03 to battery.Bidirectional, dc becomes
It changes the mold block 03 and realizes battery voltage and BUS busbar voltage bi-directional conversion, can both charge to battery, while can also be to battery
Boosting is supplied via inverter module 04 and is loaded.Main control module 01 samples the information such as solar energy, battery, alternating current, according to each signal
Amount is to carry out state conversion.
In embodiments of the present invention, the solar energy module is the facility for converting solar energy into electric energy, may include
The facility of direct current energy is converted solar energy into using the photovoltaic effect of photovoltaic semiconductors material.The core of photovoltaic facility
It is solar panel.Currently, the semiconductor material for being used to generate electricity mainly has: monocrystalline silicon, polysilicon, amorphous silicon and cadmium telluride
Deng.Wherein, solar panel, that is, solar module, effect is that the radiation energy of the sun is converted to direct current energy, root
Power and the different of voltage are required according to user, solar module used aloned is made, it can also be with several solar modules
By series connection (meet voltage requirement) and (meet current requirements) in parallel, the bigger electrical power of formation power supply array offer.
Solar charging discharging controller is also referred to as " photovoltaic controller ", and effect is can be adjusted to solar cell module electricity
And control, maximum solar charging discharging controller can to the maximum extent charge to battery, and play and overcharge to battery
Electric protection, the effect of over.Battery group is energy-storage units, so as in night or proof load electricity consumption rainy days.From
Net type inverter is responsible for direct current to be converted to alternating current, uses for AC load.
In embodiments of the present invention, the maximal power tracing module 02 is made by the working condition of adjusting electrical module
Solar components can export the electrical system of more electric energy, can send out solar panel by bidirectional, dc conversion module
Direct current out is effectively stored in energy-storage module such as battery, and it is not covered remotely can to efficiently solve normal grid
The life of area and tourist area and commercial power, generation environment does not pollute.
In another embodiment, the maximal power tracing module 02 includes boost booster circuit, passes through boost liter
Volt circuit boosts the voltage that solar panel issues, so that the voltage based on solar power system can be supplied directly
It is used to load, and does not have to be transmitted further to load into crossing after battery.
Referring to Fig. 3 and Fig. 4, illustratively provide a kind of possible implementation of maximal power tracing module 02, it is described most
The electrode input end of high-power tracking module 02 connects the positive terminal of the solar cell panel voltages output, the maximum power
The negative input of module connects the negative pole end of the solar cell panel voltages output, the control terminal of the maximum power module
Connect one end of the main control module 01.The maximal power tracing module 02 include the first inductance L1, first diode D1 and
What the PV in transistor Q1, Fig. 3 was represented is solar panel, and one end of the first inductance L1 connects the first diode
The anode of D1 and the first pole of the transistor Q1, the other end of the first inductance L1 are connecting the maximum power module just
Pole input terminal, the cathode of the first diode D1 connect the cathode output end of the maximum power module, the transistor Q1
The second pole connect the cathode output end of the maximum power module.
Transistor in the application can be bipolar junction transistor or field effect transistor.When transistor is ambipolar crystalline substance
When body pipe, control electrode refers to the base stage of bipolar junction transistor, and the first pole refers to the collector or emitter of bipolar junction transistor, corresponding
The second extremely bipolar junction transistor emitter or collector；When transistor is field effect transistor, control electrode refers to
The grid of field effect transistor, first extremely can be drain electrode or the source electrode of field effect transistor, and corresponding second extremely can be field
The source electrode of effect transistor or drain electrode.Usually in N-type transistor, the voltage of drain electrode should be greater than or equal to the voltage of source electrode,
Therefore the position of source drain can change with the difference of transistor biasing state.Since the transistor used in the display is logical
It is often thin film transistor (TFT) (TFT), therefore the embodiment of the present application might as well be illustrated by taking thin film transistor (TFT) as an example, and the application is implemented
The drain electrode of transistor and source electrode can change according to the difference of transistor biasing state in example.
The working principle of maximal power tracing module 02 is described below, detects major loop DC voltage and output electric current, meter
The output power of solar array is calculated, and realizes the tracking to maximum power point.Because the P-U curve of solar array is with non-
Linearly, change the output voltage of boost circuit, to disturb by adjusting the duty ratio of MOSFET using boost booster circuit
The bearing power of dynamic output circuit.Meanwhile the output Current Voltage of photovoltaic cell will also change therewith, pass through measurement disturbance front and back
The variation of the output power from photovoltaic cells and voltage, to determine the perturbation direction in next period, the solar energy when perturbation direction is correct
Light energy board output power increases, and the lower period will continue to disturb in the same direction, conversely, disturbing in the opposite direction, in this way, being repeated
Disturbance makes solar opto-electronic board output up to maximum power point with observation.
In another embodiment, the inverter module 04 is also used to the civil power module according to corresponding control instruction
Alternating current carry out DC converting, obtain for energy-storage module charge direct current；
The bidirectional, dc conversion module 03 is also used to for the direct current for being used for energy-storage module charging being depressured simultaneously
It is stored in the energy-storage module.
In embodiments of the present invention, referring to fig. 4, the bus refers to that multiple equipment is connect on it in the form of branch arranged side by side
One shared access is carried out arranged side by side by capacitor C1.The voltage input that the maximal power tracing module 02 exports to bus, by
Bus carries out being transmitted to inverter module 04, then one end of the capacitor C1 connects the cathode output end of the maximum power module,
The other end of the capacitor C1 connects the cathode output end of the maximum power module.
Fig. 5 and Fig. 4 are please referred to, illustratively, the electrode input end of the inverter module 04 is being connected to the bus just
Extreme point, the negative input of the inverter module 04 are connected to the cathode endpoint of the bus, the pole L of the inverter module 04
Output end is connected to the L extreme point of the load, and the N that the pole the N output end of the inverter module 04 is connected to the load is extreme
The control terminal of point, the inverter module 04 connects the main control module 01.The inverter module 04 includes transistor Q2, transistor
The first pole connection transistor Q4 of Q3, transistor Q4, transistor Q5, the second inductance L2 and capacitor C2, the transistor Q2
The first pole and the inverter module 04 electrode input end, the second pole of the transistor Q2 connects the of the transistor Q3
The cathode output end of two poles and the inverter module 04, the second pole of the transistor Q3 connect the cathode of the inverter module 04
Second pole of input terminal and transistor Q5；The first pole and described second of the second pole of the transistor Q4 and the transistor Q5
The other end of one end of inductance L2, the second inductance L2 connects one end of the capacitor C2 and the anode of the inverter module 04
Output end, the other end of the capacitor C2 connect the cathode output end of the inverter module 04, the transistor Q2, the crystal
The control electrode of pipe Q3, the transistor Q4 and the transistor Q5 are all connected with the control terminal of the inverter module 04.
Fig. 6 and Fig. 4 are please referred to, illustratively, the electrode input end of the bidirectional, dc conversion module 03 connects the mother
The positive terminal of line, the negative input of the bidirectional, dc conversion module 03 connects the negative pole end of the bus, described two-way straight
The cathode output end of stream conversion module 03 connects the positive terminal of the energy-storage module, the cathode of the bidirectional, dc conversion module 03
Output end connects the negative pole end of the energy-storage module, and the bidirectional, dc conversion module 03 includes transistor Q6, transistor Q7, crystalline substance
Body pipe Q8, transistor Q9, transistor Q10, transistor Q11, transistor Q12 and transformer T1, the first pole of the transistor Q10
The first pole of the transistor Q12 and the electrode input end of the bidirectional, dc conversion module 03 are connected, the transistor Q11's
First pole connects the first pole of the transistor Q13 and the negative input of the bidirectional, dc conversion module 03, the crystal
The second pole of pipe Q10 connects the first end of the transformer T1 and the second pole of the transistor Q11, the transistor Q12's
Second pole connects the second end of the transformer T1 and the second pole of the transistor Q13,
The first pole of the transistor Q6 connect the transistor Q7 the first pole and the bidirectional, dc conversion module 03
Cathode output end, the first pole of the transistor Q8 connect the transistor Q9 the first pole and the bidirectional, dc transformation mould
The cathode output end of block 03, the second pole of the transistor Q7 connect the transformer T1 third end and the transistor Q9
Second pole, the second pole of the transistor Q6 connect the 4th end of the transformer T1 and the second pole of the transistor Q8.
In another embodiment, the main control module 01 includes:
Data capture unit is used for, and obtains the voltage and current of solar energy module, the voltage and current of energy-storage module and city
The voltage and current information of electric module；
Status toggle unit is used for, and when energy-storage module is abnormal, civil power module is normal and solar energy module is normal, will be powered
State is switched to civil power module and combines power supply state with solar energy module, in energy-storage module exception, civil power module exception and the sun
Can module it is normal when, power supply state is switched to solar energy module power supply state, energy-storage module is normal, civil power module is normal and
When solar energy module is normal, power supply state is switched to power supply-charging state, energy-storage module is normal, civil power module is abnormal and too
When sun energy module is normal, power supply state is switched to energy-storage module and combines power supply state with solar energy module；
Instruction output unit is used for, and is switched to civil power module in the power supply state and is combined power supply state with solar energy module
When, output control solar energy module combines power supply instruction with civil power module, is switched to solar energy module in the power supply state and supplies
Electricity condition, output control solar energy module power supply instruction are switched to power supply-charging state, output control city in the power supply state
Electric module combines power supply with solar energy module, and controls the instruction that solar energy module charges to the energy-storage module, in the confession
Electricity condition is switched to energy-storage module and combines power supply state with solar energy module, and output control energy-storage module is combined with solar energy module
The instruction of power supply.
In embodiments of the present invention, the control principle of the main control module 01 is as follows: in the case where no battery, when
In the presence of alternating current, relay Rely1, Rely2 of civil power module are in closed state, and solar components are via the maximum power
It generates with alternating current by inverter module 04 with frequency, with the electric current of phase after the boost circuit boosting of tracking module 02, combines with alternating current
It powers to the load；Adjust solar energy makes it less than energy needed for loading to the energy that load provides, and insufficient section is provided by alternating current,
So as to which accurate judgement alternating current is lost.When alternating current is lost, relay Rely1, Rely2 are in an off state, solar energy group
Part generates alternating voltage to load confession by inverter module 04 via after the boost circuit boosting of maximal power tracing module 02
Electricity, it is ensured that load electric supply.When solar components energy, when being insufficient for load, system can report failure, protection load and
Equipment.In the case where there is battery, in the presence of alternating current, relay Rely1, Rely2 of civil power module are in closed state,
Solar components are same with alternating current via generating after the boost circuit boosting of maximal power tracing module 02 by inverter module 04
Frequently, with the electric current of phase, combine with alternating current and power to the load, extra energy passes through bidirectional, dc conversion module 03, to energy storage mould
The battery of block charges, adjust inverter module 04 to the energy that load provides make its be less than load needed for energy, insufficient section by
Civil power module provides, so that the voltage of load end changes rapidly when civil power module is lost, so as to effectively judge that alternating current is lost
Mistake is transferred to no utility mode, is combined by the battery and solar components of energy-storage module and is powered to the load.When alternating current is lost, city
Electric module relay Rely1, Rely2 is in an off state.Solar components are electric via the boost of maximal power tracing module 02
Road boosting generates BUS voltage.The battery of energy-storage module is connected to bus BUS and solar energy through bidirectional, dc conversion module 03
Component energy is complementary to one another, that is, when solar components energy is enough, in the case where meeting load, to energy-storage module electric power storage
Pond charging；When solar components energy is insufficient for load, battery and solar components are via BUS, inverter module 04
Combine and powers to the load.In the case that when there is alternating current, battery is fully charged, relay Rely1, Rely2 are in closed state,
Solar components are generated by inverter module 04 with alternating current with frequency, with the electric current of phase, with city Electricity Federation after boosting via boost circuit
Conjunction powers to the load.
It is wider in order to avoid occurring the frequency range of island effect and off-network inverter under power grid loss situation, it is traditional
It scrambles anti-islanding algorithm and is not suitable for off-grid system, based on this using completely newly according to the pass between load and solar components energy
System is to realize.The main control module 01 further include: power obtaining unit is used for, obtain inverter module 04 output power inverter and
Bearing power.Isolated island control unit is used for, and is less than present load power, the inverter module 04 according to current output power inverter
Output power and the bearing power, the period reduces current output power inverter one by one, with the load terminal voltage when isolated island occurs
Reduce as the output power inverter reduces.Unit is cut off to be used for, when detecting that load terminal voltage is decreased to preset value,
The relay of civil power module is disconnected, realization civil power module is cut with the grid-connected integrated solar power generation subsystem of off-network
From.
Specifically, main control unit controls the energy that inverter module 04 generates when solar components energy is greater than load energy
Amount makes it be less than the energy that load needs, and the energy that remaining load needs is supplemented by alternating current；At this time if power grid is lost, the sun
The energy that can be provided to load is reduced by the period, so that exception occurs in the voltage of load end, therefore, it is determined that power grid is lost.Work as the sun
When energy component energy is less than load energy, solar components provide fractional load energy, and the energy that remaining load needs is by alternating current
Supplement；At this time if power grid is lost, the energy that solar energy is provided to load is reduced by the period, so that the voltage appearance of load end is different
Often, therefore, it is determined that power grid is lost.In the case that when there is alternating current, battery needs to charge, relay Rely1, Rely2 are in and close
Conjunction state, solar components via maximal power tracing module 02 boost circuit boost after by inverter module 04 generate with
Alternating current with frequency, with the electric current of phase, combine with alternating current and power to the load；Meanwhile extra energy passes through bidirectional, dc conversion module
03 charges to battery.In order to avoid occurring the frequency range of island effect and off-network inverter under power grid loss situation
Wider, traditional scrambling anti-islanding algorithm is not suitable for off-grid system, based on this using completely newly according to load and solar components
Relationship between energy is realized.When solar components energy is greater than load energy and battery rechargeable energy summation, master control
Unit controls the energy that inversion link generates, it is made to be less than the energy that load needs, and the energy that remaining load needs is mended by alternating current
It fills；At this time if power grid is lost, the energy that solar energy is provided to load is reduced by the period, so that the voltage appearance of load end is different
Often, therefore, it is determined that power grid is lost.When solar components energy is less than load energy and battery rechargeable energy summation, solar energy
Component preferentially powers to the load, and only provides fractional load energy, and the energy that remaining load needs is supplemented by alternating current；At this time if
Power grid is lost, and the energy that solar energy is provided to load is reduced by the period, so that the voltage appearance of load end is abnormal, therefore, it is determined that electric
Net is lost.In alternating current missing, solar components are via bus BUS voltage is formed after maximal power tracing module 02, via inverse
Become module 04 to power to the load.When photovoltaic energy component energy deficiency, after storage battery energy is via bidirectional, dc conversion module 03
BUS voltage is formed, load energy insufficient section is supplemented；When photovoltaic energy component energy is greater than load energy, solar components energy
Amount charges via after bidirectional, dc conversion module 03 to battery.
Implementing the present embodiment has following outstanding feature:
A kind of grid-connected integrated solar power generation subsystem of off-network provided by the present application, comprising: main control module 01 is used for
Obtain voltage and current, the voltage and current of energy-storage module and the voltage and current information of civil power module of solar energy module, root
It is powered state switching according to the voltage and current information of acquisition, exports corresponding control instruction；Maximal power tracing mould
Block 02, the direct current for exporting the solar energy module boost, and obtain the voltage boosting dc electricity for load supplying；It is double
To DC converting module 03, for carrying out energy-storage module charging or energy-storage module power supply according to corresponding control instruction；Wherein, institute
Stating energy-storage module charging is that the voltage boosting dc electricity that will be received is depressured and is stored in the energy-storage module；Wherein, the storage
Energy module for power supply is that the voltage of the energy-storage module boosts, voltage boosting dc electricity of the output for load supplying；Inversion mould
Block 04 for receiving the voltage boosting dc electricity by bus, and carries out the voltage boosting dc electricity according to corresponding control instruction
Exchange conversion exports the alternating current for being supplied to load.Solar energy module is exported by the maximal power tracing module 02
Direct current boost, obtain being supplied to the direct current that load is powered, then the direct current of solar energy module output
Load supplying is carried out after being stored without energy-storage module again, reduces the conversion of energy, and reduces energy
Loss avoids the multistage conversion passed through when transmitting power to load by solar energy module, improves energy conversion efficiency.
Bidirectional, dc conversion module 03 to dc voltage boost or can be depressured, then filling for the energy-storage module may be implemented
Electricity and electric discharge.The energy of maximizing generated using solar components, while can ensure the Electrical Safety of terminal user, it avoids
There is power grid island effect.
Referring to Fig. 7, according to second aspect, a kind of integrated solar power generation system of grid-connected off-network is provided in a kind of embodiment
System, which is characterized in that including the integrated solar power generation subsystem of the upper grid-connected off-network, solar energy module 05, energy storage
Module 06 and civil power module 07；
The solar energy module 05, for converting the solar into electric energy；
The energy-storage module 06, for storing electric energy；
The civil power module 07, for by the power output of public electric wire net.
The integrated solar power system of grid-connected off-network passes through the grid-connected integrated solar power generation of off-network
Subsystem completes the distribution of energy between solar energy and alternating current, is exported by the maximal power tracing module 02 to solar energy module
Direct current boost, obtain being supplied to the direct current that load 09 is powered, output direct current supplies electricity to bus 08, there is mother
Line 08 is transferred to inverter module and carries out exchange conversion, then the direct current of solar energy module output is carried out without energy-storage module 06
09 power supply of load is carried out after storage again, reduces the conversion of energy, and reduce the loss of energy, avoids by too
The multistage conversion passed through when positive energy module transfer energy is to load, improves energy conversion efficiency.Bidirectional, dc conversion module 03
It to dc voltage boost or can be depressured, then the charge and discharge of the energy-storage module may be implemented.Maximizing
The energy generated using solar components, while can ensure the Electrical Safety of terminal user, avoid the occurrence of power grid island effect.
The bidirectional, dc conversion module 03 can charge to the energy-storage module 06, by the solar energy module received or
The electric energy of civil power module is handled as being transferred to energy-storage module 06 after decompression filtering.
Use above specific case is illustrated the present invention, is merely used to help understand the present invention, not to limit
The system present invention.For those skilled in the art, according to the thought of the present invention, can also make several simple
It deduces, deform or replaces.
Claims (6)
1. a kind of integrated solar power generation subsystem of grid-connected off-network characterized by comprising
Main control module, for obtaining the voltage and current and civil power module of the voltage and current of solar energy module, energy-storage module
Voltage and current information is powered state switching according to the voltage and current information of acquisition, exports corresponding control and refers to
It enables；
Maximal power tracing module, the direct current for exporting the solar energy module boost, and obtain supplying for loading
The voltage boosting dc electricity of electricity；
Bidirectional, dc conversion module, for carrying out energy-storage module charging or energy-storage module power supply according to corresponding control instruction；Its
In, the energy-storage module charging is that the voltage boosting dc electricity that will be received is depressured and is stored in the energy-storage module；Wherein, institute
Stating energy-storage module power supply is that the voltage of the energy-storage module boosts, voltage boosting dc electricity of the output for load supplying；
Inverter module, for receiving the voltage boosting dc electricity by bus, and it is according to corresponding control instruction that the boosting is straight
Galvanic electricity carries out exchange conversion, exports the alternating current for being supplied to load.
2. the grid-connected integrated solar power generation subsystem of off-network as described in claim 1, which is characterized in that including it is described most
High-power tracking module includes boost booster circuit.
3. the grid-connected integrated solar power generation subsystem of off-network as claimed in claim 2, which is characterized in that including described inverse
Become module to be also used to that the alternating current of the civil power module is carried out DC converting according to corresponding control instruction, obtain for energy storage
The direct current of module charging；
The bidirectional, dc conversion module is also used to that the direct current for being used for energy-storage module charging is depressured and is stored in
The energy-storage module.
4. the grid-connected integrated solar power generation subsystem of off-network as claimed in claim 3, which is characterized in that the master control mould
Block includes:
Data capture unit is used for, and obtains the voltage and current of solar energy module, the voltage and current of energy-storage module and alternating current mould
The voltage and current information of block；
Status toggle unit is used for, when energy-storage module is abnormal, civil power module is normal and solar energy module is normal, by power supply state
It is switched to civil power module and combines power supply state with solar energy module, in energy-storage module exception, civil power module exception and solar energy mould
When block is normal, power supply state is switched to solar energy module power supply state, energy-storage module is normal, civil power module is normal and the sun
Can module it is normal when, power supply state is switched to the state of power supply-charging, energy-storage module is normal, civil power module exception and the sun
When energy module is normal, power supply state is switched to energy-storage module and combines power supply state with solar energy module；
Instruction output unit is used for, when the power supply state is switched to civil power module and combines power supply state with solar energy module,
Output control solar energy module combines power supply instruction with civil power module, is switched to solar energy module power supply shape in the power supply state
State, output control solar energy module power supply instruction are switched to power supply-charging state, output control alternating current mould in the power supply state
Block combines power supply with solar energy module, and controls the instruction that solar energy module charges to the energy-storage module, in the power supply shape
State is switched to energy-storage module and combines power supply state with solar energy module, and output control energy-storage module combines power supply with solar energy module
Instruction.
5. the grid-connected integrated solar power generation subsystem of off-network as claimed in claim 4, which is characterized in that the master control mould
Block further include:
Power obtaining unit is used for, and obtains the output power inverter and bearing power of inverter module；
Isolated island control unit is used for, and is less than present load power, the inverter module output work according to current output power inverter
Rate and the bearing power, the period reduces current output power inverter one by one, with when isolated island occurs load terminal voltage with institute
Output power inverter is stated to reduce and reduce；
It cuts off unit to be used for, when detecting that load terminal voltage is decreased to preset value, the relay of civil power module is disconnected, is realized
Civil power module is cut off with the grid-connected integrated solar power generation subsystem of off-network.
6. a kind of integrated solar power system of grid-connected off-network characterized by comprising such as any one of claim 1-5
The integrated solar power generation subsystem of the grid-connected off-network, solar energy module, energy-storage module and civil power module；
The solar energy module, for converting the solar into electric energy；
The energy-storage module, for storing electric energy；
The civil power module, for by the power output of public electric wire net.
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